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Don't let your first stop in the gym expose you to triclosan, a common ingredient in antibacterial soaps that is linked to thyroid disease, compromised immune systems, and hormonal chaos that could affect your weight and health. Just last month, a study published in journal Environmental Health Perspectives found a link between triclosan and allergies. Avoid gyms that use antibacterial soaps or, if you're already a member, ask management to start using unscented Green Seal Certified soaps that skip the harmful compounds. Or bring along your own safe soap or hand cleanser, such as ones from Dr. Bronner's or Pangea. Finally, keep an eye out for gym equipment marked "antibacterial." Though triclosan isn't the only chemical used in such products, there's no way for you to know what was used.